Revenue - Summary of revenues by end-use markets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Consolidated net sales	$ 351.9	$ 585.4	$ 1,054.0	$ 1,743.8
Aerospace and Defense
Disaggregation of Revenue [Line Items]
Consolidated net sales	163.0	356.4	509.4	1,058.4
Medical
Disaggregation of Revenue [Line Items]
Consolidated net sales	35.0	53.0	100.2	151.0
Transportation
Disaggregation of Revenue [Line Items]
Consolidated net sales	36.9	33.5	97.7	111.9
Energy
Disaggregation of Revenue [Line Items]
Consolidated net sales	23.1	32.7	70.3	103.2
Industrial and Consumer
Disaggregation of Revenue [Line Items]
Consolidated net sales	67.2	80.1	206.6	231.4
Distribution
Disaggregation of Revenue [Line Items]
Consolidated net sales	$ 26.7	$ 29.7	$ 69.8	$ 87.9